Disk braking device

ABSTRACT

A disk-braking device comprises a disk-braking piece, a brake, and a pair of friction pads installed in the brake and having a predetermined area. The two friction pads can clamp or release the disk-braking piece for rubbing the disk-braking piece to reduce the rotary speed or stop the rotation of the disk-braking piece. The disk-braking piece are piece-like bodies. The portion of the disk-braking piece passing through the two friction pads is formed with a plurality of openings having a predetermined shape and spaced with a predetermined distance. The arrangement of the openings is periodic. Openings at the same period have different areas. The area of each opening is smaller than that of the two friction pads. As the car brakes, a periodic variation of the friction torque generates to prevent the wheels from sliding. Therefore, a preferred braking effect is presented.

FIELD OF THE INVENTION

[0001] The present invention relates to a disk-braking device, andparticularly to a disk-braking piece used in cars, motorcycles orbicycles.

BACKGROUND OF THE INVENTION

[0002] Referring to FIG. 1, the prior disk-braking device comprises around disk-braking device 92 which is coaxially installed to a wheelshaft, a brake 94 and friction pads 96 installed in the brake 94. Thebrake 94 is firmly secured to a car body and is adjacent to thedisk-braking piece 92. The two friction pads can clamp or release thedisk-braking piece 92 for rubbing the disk-braking piece to reduce therotary speed or stop the rotation of the disk-braking piece 92.

[0003] Since in braking, a very large amount of heat generates, aplurality of identical openings are distributed in the disk-brakingpiece to have a preferred heat dissipating effect to avoid hightemperature to affect the braking function.

[0004] In braking, especially emergency braking, it is often that thebrake is locked, namely, the wheels slide so as not to control the carbody. Therefore, an anti-lock barking system (ABS) is invented. That is,a sensor is installed in a brake, so, when the wheels slide in braking,during a predetermined time, friction pads may clamp and release thewheel continuously to prevent the wheel from sliding.

[0005] The ABS is very expensive and has complicated parts, andtherefore, it is more suitable in cars instead of motorcycles orbicycles. Not only the mounting work is complicated, but also the costis high. Therefore, it can be said that ABS is completely unsuitable tomotorcycles and bicycles.

SUMMARY OF THE INVENTION

[0006] Accordingly, the primary object of the present invention is toprovide a disk-braking device, wherein as the car brakes, a periodicvariation of a friction torque according to the present invention willbe induced so as to prevent the wheels from sliding. Therefore, apreferred braking effect is presented.

[0007] To achieve above objects, the present invention provides adisk-braking device which comprises a disk-braking piece, a brake, and apair of friction pads installed in the brake and having a predeterminedarea. The two friction pads can clamp or release the disk-braking piecefor rubbing the disk-braking piece to reduce the rotary speed or stopthe rotation of the disk-braking piece. The disk-braking piece haspiece-like bodies. At the portion of the disk-braking piece passingthrough the two friction pads is installed with a plurality of openingshaving a predetermined shape and spaced with a predetermined distance.The arrangement of the openings is periodic. Openings at the same periodhave different areas. The area of each opening is smaller than those ofthe two friction pads.

[0008] The various objects and advantages of the present invention willbe more readily understood from the following detailed description whenread in conjunction with the appended drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009]FIG. 1 is a schematic perspective view of a prior disk-brakingdevice.

[0010]FIG. 2 is a schematic perspective view of the disk-braking piece

[0011]FIG. 3 is a front view of the first preferred embodiment of thepresent invention.

[0012]FIG. 4 is a front view of the second preferred embodiment of thepresent invention.

[0013]FIG. 5 is a front view of the third preferred embodiment of thepresent invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Referring to FIGS. 2 and 3, the disk-braking device 1 of thepresent invention is illustrated. The disk-braking device 1 includes adisk-braking piece 12 and a brake 14.

[0015] The disk-braking piece 12 is a round piece with a predeterminedthickness and radius and is coaxially firmly secured to a wheel shaft.The disk-braking piece 12 rotates synchronously with the wheel shaft.

[0016] The brake 14 has a base 42, a movable arm 44 protruding from thebase 42 and a pair of friction pads 46 which are piece-like bodies withpredetermined shape. The friction pads 46 are spaced andmirror-symmetrically installed within the base 42. A transmission meansis installed between the two friction pads 46 and the arm 44 so thatwhen the arm 44 swings, the two friction pads 46 may move reciprocallyalong opposite directions. The brake 14 is firmly secured to a car by apredetermined portion of the base 42 and is adjacent to the disk-brakingpiece 12 so that the outer edge of the disk-braking piece 12 is receivedbetween the two friction pads 46.

[0017] At the portion (called as a friction portion) of the disk-brakingpiece 12 passing through the two friction pads 46 is installed with aplurality of openings 22 having a predetermined shape and spaced with apredetermined distance. The arrangement of the openings 22 is periodic.Openings 22 at the same period have different areas. The area of eachopening 22 is smaller than those of the two friction pads 46.

[0018] If the areas of the openings 22 at the same period along aclockwise direction are formed as a series A_(K), and the area of eachfriction pad 46 is A_(P), while

[0019] A_(K)<A_(P)

[0020] A_(K−1)=r A_(K), 0<r<1, K=1, 2, 3, . . . n

[0021] The number of the items (openings)=n+1

[0022] By above structure, when a car moves, as the arm 44 swings sothat the two friction pads 46 approach toward and touch the disk-brakingpiece 12. Then, the friction force from the disk-braking piece 12resists against the torque so as to prevent the wheel from rotating.Since the friction portion is periodic and has a different area.Therefore, the friction torque is continuous and periodic so as toinduce the effect of an anti-lock braking system (ABS).

[0023] The disk-braking piece 12 of the present invention has thefollowing advantages:

[0024] 1. By the opening 22 at the friction portion of the disk-brakingpiece 12, the friction torque can be changed easily and has the effectof abrasive braking. Moreover, the heat dissipation of the presentinvention is considered.

[0025] 2. The openings 22 at the friction portion of the disk-brakingpiece 12 provide a preferred braking effect to the manufacturers andusers without increasing cost.

[0026] In above structure, the coefficient r can be set to be largerthan 1 so as to generate a continuous and periodic friction torque.

[0027] Referring to FIG. 4, another the present invention of the presentinvention is illustrated. In the disk-braking device 1 of thisembodiment of the present invention, the areas of the openings 22 at thesame period along a clockwise direction are formed as a series A_(K),and the area of each friction pad 46 is A_(P), while

[0028] A_(K)<A_(P)

[0029] A_(K−1)=r A_(K), 0<r<1, K=2, 3, . . . n

[0030] The number of the items (openings)=2n

[0031] In the former n+1 items, A_(K−1)/A_(K)=r, 0<r<1

[0032] The first item of the last n−1 items is A_(K+1), the last n−1items are a series with an equal ratio of 1/r.

[0033] Or in the former n+1 items A_(K−1)/A_(K)=r, r>1

[0034] The first item of the last n−1 items is A_(K+1), the last n−1items are a series with an equal ratio of 1/r.

[0035] Referring to FIG. 5, in above disk-braking device 1 of thepresent invention, the portion (called as a friction portion) of thedisk-braking piece 12 passing through the path of the two friction pads46 has a shape like a curve with a radius of curvature changedperiodically. Only changing the friction areas of the two friction pads46 will cause the friction torque to change continuously andperiodically so as to present the mechanism of an anti-lock brakingsystem (ABS).

[0036] The present invention is thus described, it will be obvious thatthe same may be varied in many ways. Such variations are not to beregarded as a departure from the spirit and scope of the presentinvention, and all such modifications as would be obvious to one skilledin the art are intended to be included within the scope of the followingclaims.

What is claimed is:
 1. A disk-braking device comprising a disk-braking piece, a brake, and a pair of friction pads installed in the brake and having a predetermined area; wherein disk-braking piece is coaxially firmly secured to a wheel shaft; the disk-braking piece is firmly secured to a car body and is adjacent to the disk-braking piece so that an outer edge of the disk-braking piece is received between the two friction pads; thereby, the two friction pads can clamp or release the disk-braking piece for rubbing the disk-braking piece to reduce the rotary speed or stop the rotation of the disk-braking piece; characterized in that: the disk-braking piece is piece-like bodies with predetermined shape; the portion of the disk-braking piece passing through the two friction pads is formed with a plurality of openings having a predetermined shape and spaced with a predetermined distance; the arrangement of the openings are periodic; openings at the same period have different areas; the area of each opening is smaller than those of the two friction pads; if the areas of the openings at the same period along a clockwise direction are formed as a series A_(K), and the area of each friction pad is A_(P), then A_(K)<A_(P) A_(K−1)=r A_(K), 0<r, K=1, 2, 3, . . . n and the number of the items (openings)=n+1.
 2. The disk-braking device as claimed in claim 1, wherein 0<r<1.
 3. The disk-braking device as claimed in claim 1, wherein r>1.
 4. A disk-braking device comprising a disk-braking piece, a brake, and a pair of friction pads installed in the brake and having a predetermined area; wherein disk-braking piece is coaxially firmly secured to a wheel shaft; the disk-braking piece is firmly secured to a car body and is adjacent to the disk-braking piece so that an outer edge of the disk-braking piece is received between the two friction pads; thereby, the two friction pads can clamp or release the disk-braking piece for rubbing the disk-braking piece to reduce the rotary speed or stop the rotation of the disk-braking piece; characterized in that: the disk-braking piece is piece-like bodies with predetermined shape; at the portion of the disk-braking piece passing through the two friction pads is installed with a plurality of openings having a predetermined shape and spaced with a predetermined distance; the arrangement of the openings are periodic; openings at the same period have different areas; the area of each opening is smaller than those of the two friction pads; if the areas of the openings at the same period along a clockwise direction are formed as a series A_(K) , and the area of each friction pad is A_(P) , then A_(K)<A_(P) A_(K−1)=r A_(k), 0<r<1, K=2, 3, . . . n the number of the items (openings)=2n in the former n+1 items A_(K−1)/A_(K)=r, 0<r<1 and a first item of the last n−1 items is A_(K+1), the last n−1 items are an equal ratio series with a ratio of 1/r.
 5. The disk-braking device as claimed in claim 5, wherein 0<r<1.
 6. The disk-braking device as claimed in claim 5, wherein r>1.
 7. A disk-braking device comprising a disk-braking piece, a brake, and a pair of friction pads installed in the brake and having a predetermined area; wherein disk-braking piece is coaxially firmly secured to a wheel shaft; the disk-braking piece is firmly secured to a car body and is adjacent to the disk-braking piece so that an outer edge of the disk-braking piece is received between the two friction pads; thereby, the two friction pads can clamp or release the disk-braking piece for rubbing the disk-braking piece to reduce the rotary speed or stop the rotation of the disk-braking piece; characterized in that: the portion of the disk-braking piece passing through the path of the two friction pads has a shape like a curve with a radius of curvature changed periodically so as to change friction areas of the two friction pads. 